DARIS (Deformation Analysis Using Recursive Interferometric Systems) a new algorithm for displacement mesuremtnes through SAR interferometry

In the present work we describe a new and alternative repeat-pass interferometry algorithm designed and developed with the aim to: i) ncrease the robustness wrt to noise by increasing the number of differential interferograms and consequently the information redundancy; ii) guarantee high performances in the detection of non linear deformation without the need of specifying in input a particular cinematic model. The starting point is a previous paper dedicated to the optimization of the InSAR coregistration by finding an ad hoc path between the images which minimizes the expected total decorrelation as in the SABS-like approaches. The main difference wrt the PS-like algorithms is the use of couples of images which potentially can show high spatial coherence and, which are neglected by the standard PSI processing. The present work presents a detailed description of the algorithm processing steps as well as the results obtained by processing simulated InSAR data with the aim to evaluate the algorithm performances. Moreover, the algorithm has been also applied on a real test case in Poland, to study the subsidence affecting the Wieliczka Salt Mine. A cross validation wrt SPINUA PSI-like algorithm has been carried out by comparing the resultant displacement fields.